的数值模拟激光超声检测蜂窝材料内部缺陷..docVIP

毕业设计说明书(论文) 作 者: 学 号： 学院(系): 理学院 专 业: 光信息科学与技术 题 目: 激光超声检测蜂窝材料内部缺陷 的数值模拟 指导者： (姓 名) (专业技术职务) 评阅者： (姓 名) (专业技术职务) 2012 年 6月 毕业设计说明书（论文）中文摘要 激光超声无损检测技术是材料无损检测的一种重要手段，是目前人们所关注的一种重要的检测方法。传统的无损检测方法具有一定的局限性，在一些恶劣的检测环境中或被检测物具有放射性时，已不能满足要求。在蜂窝材料制造和使用过程中，蜂窝材料不可避免的会产生内部缺陷。为了增加材料的使用寿命以及提高安全系数，我们应当能够随时知道材料的结构特征及应力的变化。本文中介绍了检测蜂窝材料内部缺陷的一些方法，并阐述了激光超声检测技术相比于其他检测技术的优势。采用有限元方法，构建蜂材料模型进行了激光超声检测蜂窝材料内部缺陷的数值模拟，通过温度场和时域波形的分析，对激光超声在材料中传播过程进行了理论研究 关键词 蜂窝材料 激光超声 有限元方法 毕业设计说明书（论文）外文摘要 Title Numerical simulation of the laser ultrasonic testing of honeycomb material internal defects Abstract The laser supersonic none destructive method the examination technology is the material none destructive method the examination one important method, is one important examination method which the present people pays attention. The tradition none destructive method the examination method to have the certain limitation, in certain bad examination environment or was measured the detected objects radioactive, has not been able completely to answer the purpose. In the process of manufacture and use of honeycomb material, the honeycomb material produce detect is inevitable. In order to increase the service life of materials and to improve safely factor, we should be able to know the structural characteristics of the material and the stress change at any time. In this article some of the methods of the detection of honeycomb material internal defects is described, and described the laser ultrasonic testing technology advantages, compared to other detection technique. By use Finite element method to build honeycomb material models for numerical simulation of laser ultrasonic testing of honeycomb material defects within. Then by analysis the temperature field and time-domain waveform of laser ultrasound to carried out theoretical studies of th